Apparatus for lighting and extinguishing gas-lamps.



PATENTED OCT. 1, 1907. E. H. ELTON & R. STEPHENS. APPARATUS POR LIGHTING AND EXTINGUISHING GAS LAMPS.

APPLICATION FILED AUG. 6, 1907.

EQ E. ELTON a E'. STEPHENS.

PATBNTBD OGT. l, 1907.

APIPLIGATIOH FILED AUG. 6. 1907.

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Y PATENTED 00T.1, E. E. ELTON E E. STEPHENS. APPARATUS PoE LIGHTING AND EXTINGUISEING GAS LAMPS.

APPLICATION FILED AUG. 8, 1907.

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'UNrrnD sfrxrns PATENT OFFICE.

EDMUND HARRY ELTON AND RICHARD STEPHENS, OF GLEVEDON, ENGLAND.

APPARATUS FOR LIGHTING AND EXTINGUISHING GAS-LAMPS.

To all whom tt may concern:

Be it known that we, EDMUND HARRY ELTON, a subject of the King of Great Britain and Ireland, residing at Clevedon Court, Clevedon, Somersetshire, England, and RICHARD STEPHENS, a subject of the King of Great Britain and Ireland, residing at 9 The Triangle, Clevedon, Somersetshire, England, have invented certain new and useful Apparatus for Lighting and Extinguishing Gas-Lamps, of which the following is a specification.

This invention relates to apparatus for lighting and extinguishing gas lamps by variation of pressure in the gas mains. According to this invention the said lamps are each provided with a pilot light, for lighting the main burner, and there is provided in the pipe or passage by which the gas from the main communicates with the burner a closed chamber, containing, or in communication with, a bellows7 or flexible diaphragm in, or on, which the gas pressure admitted to the said chamber acts and through it and through a weighted lever, or system of levers, causes a valve or valves to be operated so as to admit gas, and cut off the supply of gas alternately, to the main burner and to the pilot light of the lamp, the said valve or valves being so arranged and operated that when the main burner is alight, the pilot light is extinguished, and vice versa. The valves, according to one arrangement, are connected to or acted on by a lever which lever is within the closed chamber and is provided at its free end with an adjustable weight, or in conjunction with the said lever a spring may be employed by means of which the pressure of gas required to operate the valves can be regulated as desired. This lever is connected to the bellows, or flexible diaphragm, by an adjustable screw connection, and according to the distance this connection is from the fulcrum of the lever, so will depend the pressure required to operate the valve or valves to effect the lighting and extinguishing of the lamp burner or vary the difference of pressure required for lighting and extinguishing the burner.

The adjustment of the connection of the bellows, or flexible diaphragm, to the lever to which the valves are connected can be effected by screw and nut arrangement carried' by the lever and instead of an adjustable weight, or spring, the said lever may be provided with a screw adjustment to vary as required the pressure neeessary to operate the valves.

A separate valve may be provided for each of the passages, to the main burner, and to the pilot light or a single valve of any suitable construction may be provided for governing the two passages in such manner that when the gas pressure on the main rises to a predetermined point the gas will be admitted to the main burner and when the pressure is reduced below the predetermined point the supply of gas to the main burner will be cut off.

Specification of Letters Patent.

Application filed August 6, 1907. Serial No. 387,361.

Patented Oct. 1, 1907.

If it be desired to light the main burner at high pressure and to retain it alight while low pressure is extinguishing other main burners and eventually to extinguish the aforesaid main burner at low pressure preceded by a temporary high pressure there may be loosely hung from the lever to which the bellows or diaphragm is attached a swinging arm, the lower end of which is arranged to engage a fixed catch or projection. This arm is provided for the purpose of retaining the burner alight when the gas pressure is reduced, for example when the pressure increases, the bellows, or diaphragm, will raise the said arm so that its lower end will slide up an inclined surface of the fixed catch to above the upper end thereof, then if the pressure is reduced the lower end of the arm will descend into contact with the upper surface of the fixed catch and thereby keep the valve in the passage communicating with the main burner open, then to extinguish the light the pressure is again raised thereby raising the arm which will then swing and pass off the top surface of the fixed catch so that when the pressure is again reduced the arm will descend together with the lever below the fixed catch u t A,...

and thereby close the valve leading to the main burner and open the valve of the passage leading to the pilot light. The fixed catch may be provided with a number of stops in different positions'so that any one of a number of lamps or one series of a number of series of lamps, can be lighted and extinguished separately. It is obvious that instead of making the arm to swing on the lever, the arm may be rigidly connected to the lever and the catch be made movable as hereinafter described.

Instead of connecting the valves to the lever to which the bellows, or diaphragm, is attached, the valves may be connected to a rocking lever7 having therein inclined slots or a double inclined slot, one of the inclined slots being arranged on each side of the fulcrum of the said lever. In these inclined slots or the double inclined slot enters a proj eetion from an arm or link pivoted to the lever which is connected to the bellows, or diaphragm, so that the lamp can be both lighted and extinguished at high pressure, andthe said slotted lever can be provided or combined with catches, or stops, for the projection on the pivoted arm or link to engage with, so that any one of a number of lamps, or the lamps of any area of a number of areas of lamps, or one or .more lamps of a cluster of lamps, can be separately lighted or extinguished.

The diaphragm, bellows, or bag, or the like, on which the gas pressure acts, may be carried, or inclosed, in a casing which may be fixed to the chamber containing the valves by means of a clamping screw and nut, or the like, so as to be capable 0f being readily-rediaphragm, bellows, bag, or the like, can be secured in its case by the same screw and nut, or the said iexible diaphragm, bellows, or the like, can be attached to its case by a sufficiently strong adhesive material which will secure it in position7 but which will admit of its being easily detached when required. j

There may be a small pipe or other connection provided leading from the interior of the case protecting the diaphragm, to the open air so that in the event oi the diaphragm being injured or worn the gas would leak through it, the said gas could be lighted by hand or automatically by extending the pipe up to the pilot burner when its ignition would indicate that the diaphragm had become defective.

In a cold climate means may be provided to maintain the apparatus warm, for example a small tube heated by the gas, may be arranged in proximity to the apparatus to warm the diaphragm chamber.

1n order that our invention may be clearly understood we will further describe the same with reference to the accompanying drawings premising however that we do not restrict ourselves to the precise construction and arrangement oi parts described and illustrated.

Figure 1 represents in sectional elevation the general construction and arrangement of one iorm oi apparatus according to our invention as applied to a single lamp the main burner oi which is caused to be lighted by high pressure oiv gas and caused to be extinguished by low pressure; Fig. 1u is a detail view oi the rod 24 and its projection. Figs. 2 and 2lL are side views oi moditied details. Fig. 3 is a view similar to Fig. 1 oi a modified iorm of the apparatus. Fig. 4 is a view similar to Figs. 1 and 3 but showing a further modification. Fig. 4% is a detail view of a modified part. Fig. 5 is an elevation showing an attachment for indicating leaks in the bellows. Fig. 6 is a similar view showing a warming attachment. Figs. 7 to 10 respectively are detail views of modified forms of valve mechanism. Fig. 11 is a view oi a urther modification oi the check mechanism. Fig. 12 is a detail view of a further modiication of valve mechanism. Figs. 13 to 14 are detail views in part sectional elevation and plan o a modification oi the manner oi Connecting the bellows and casing.

1 is a closed chamber connected by screwing or otherwise to the gas supply pipe in connection with the gas main the said gas supply pipe communicating with the interior of the chamber 1 by the passage 2. To the chamber 1 is connected the main burner 3 and the pilot burner 4 of the lamp, the passages for the gas from the chamber 1 to the said main and pilot burners being governed respectively by valves 5 and G connected to, or operated by, the opposite ends of a lever 7 fulcrumed at 8 to the interior of the chamber 1 or the passages to both of the burners may be governed by a slide valve as shown in Fig. 12 or other convenient valve as shown in Figs. 7 8, 9 and 10 hereinafter more particularly described.

Projecting from the lever 7 is an arm 9 to the outer end oi which is connected one end oi a link l0 the other end of the said link being connected to a lever 11 inlcrumed at 12 to the interior oi the chamber 1 and provided at one end with a stud 13 to which is connected, by a rod 14 the bellows, or flexible diaphragm l5, on which the gas pressure acts, which bellows or diaphragm is preferably inclosed :in a casing 16 and connectseras@ ed to and communicating with the interior ot the chamber 1.

The rod 14 is provided with a collar or shoulder l 7 between which and the bellows or tlexible. diaphragm is interposed a spring 18 the tension ot' which ean be regulated by a nut 1E) screwed into the end ot' the rod |t which projects to outside the bellows, or tlexible diaphragm and through a concave washer or plate -lll in terposed between the nut l5) and the bellows or dia phragm so as to support and steady the said bellows, or diaphragm, the said spring 1S also maintaining thc diaphragm 15 in correct position against the said concave washer or plate 44. rlhe pressure of gas entering the closed chamber' 1 and acting on the bellows or diaphragm l5 causes through the rod lst the lever ll to rock on its fulcrum 12 and raise the opposite end ol` the said lever which is screw threaded and provided with an adjustable weight 20 which can be adjusted to govern as required the pressure necessary to operate the valves 5 and G. When the pressure oi gas in the chamber ,I acting on the diaphragm l5 is sutlicient to overt-onul the counterbalance weight 20 the lever l l will be caused lo rock on its ulcrum 12 and through the connecting link 10 and lever 7 open the valve 5 in the pa t to the main burner 3 and close the valve o 1n the passage leading to pilot burner Al. \\'hen the pressure ol' gas in the chamber 1 is reduced the weight 2t) will cause the lever ll to rock on its iulcrum '12in the opposite direction and through the. connecting link l0 roch the lever 7, close the valve 5 oi the main burner and open the valve G in the passage leading to the pilot burner.

In Fig. 1 is shown an arrangement whereby the extent oi travel oi the lever ll on the iulerum l2 can be governed by means ol an adjustable stop l2" againstI which a projection ll. on the lever vll comes into contact to arrest the descent ot the tail end oi the said lever when the pressure oi gas is raised to light the lamp so that the difference between the light ingand extinguishing pressures can be altered as required; l'or instance il` is obvious that the further the lever il moves ou its I'ul Crum 12 the more power the pressure ot` gas has on the diaphragm because. the pin or stud iii which connects the diaphragm to the lever moves more to one side ot theliulcrum l2 oi' the lever and so by adjustingr the lstop 12a the pressure lor evtinguishing` the main burner can be regulated without altering the pressure for lighting as the lever` always returns to the same place i irlighting. Clearance between the lower end oi the valve spindles leading 5 and G and the lever 7 permits ot' the. required play necessary or the lever .ll in this arrangenwnt oII adjustment. Instead of or in addition to the adjustable weight 2() the pressure oi the gas required to operate the valves may be regulated by varyingl as required the distance oi the adjustable stud 12%, to which the tlexible diaphragm 15 is connected, from the iulcrum l2 ot the lever 11, and this adjustment ol the stud Iii can be et` ected by turning the screw 2l in the screw thread on the stud 13 which is fitted to slide but prevented l'rom turnnig in an angular slot, 22 in the end oi the lever il. Or the arrangement shown in Fig. ft may be employed in which arrangement an internal screw thread is pro vided inthe stud 13 in which works a` screw 2l attached at its inner end to the adjustablesttnl lil in which an adjusting screw 2lfL works so that. by means ot the said screws 21 and 21a the position ol the stud lil can be adjusted nearer to or further from the fulcrum 'l2 of the lever 11 so as to vary as required the pressure of the gas on the diaphragm necessary to operate the valves.

The gas passages from the chamber l to the burners are provided with holes 23 through which the gas passes.

1f the main burner 3 is required to be lighted at high pressure and tq be retained alight while a low pressure is extinguishing other main burners and eventually to be extinguished at a reduced pressure preceded by a temporary high pressure there is suspended from the weighted arm of the lever 11 a swinging rod or plate 24 having thereon a lateral projection which when the lever arm 11 is raised by the gas pressure acting on the bellows, or diaphragm', passes up an outwardly inclined surface 25 of a piece 26 fixed in the interior of the chamber 1 and inclosed in an extension 27 connected thereto, the lateral projection on the swinging rod or plate rising above the upper end of the piece 26 so that when the pressure of gas is slightly reduced the lateral projection will descend into a notch or recess 28, the upper end of the said piece 26 to maintain the valve 5 open and the burner remains alight. To extinguish the burner the pressure is slightly increased so as to lift Athe lateral projection on the rod or arm 24 out of the recess or notch 28 which lateral projection will then swing to outside the notch or recess 28 so that when the pressure of gas is reduced the lateral projection will descend the opposite or straight side 29 of the piece 26 ready for relighting the burner, which is now extinguished by the descent of the lever 11 reversing the position of the valves 5 and 6.

1t will be understood that sonne vor" the parts illus'- trated in Fig. 1 are not essential to all lamps and maybe dispensed with according' to requirements, for instance, ii it be desired to light the main burner when the gas pressure is raised and to extinguish the same when the gas pressure is first reduced, the swinging arm 24 and the adjustable stop 12 are dispensed with, the adjustment for altering the difference between lighting and extinguishing pressures being made by the screw 21. In this case the end of the valve (3 would fit closely into the groove in the end of the lever 7, similarly as shown in respect to the valve 5. Or by dispensing with the screw 21 and the swinging arm 24 and making the stud 13 a fixture in a position to make a given diference o pressure and having only the end oi the valve 5 fitting loosely into the end of the lever 7, lthe end of the valve 6 resting upon the other end of the lever 7, the said main burner will light when the gas pressure is raised and will be extinguished when the gas pressure is first reduced, the adjustment for altering the difference between lighting and extinguishing pressures being madeby the adjustable stop 121. Or again, by dispensing with the adjustable stop 12, and retaining the screw 21, for altering the adjustment of pressure of the gas as aforesaid, and having the end of the Valve 5 fitting into the end of the lever 7, the valve 6 resting vupon the other end of the lever 7, the main burner of the lamp will light when the gas pressure is raised and with the use of the swinging arm 24 and catch 26 the burner will be retained alight during the first reduction 'of pressure oi the gas, the said main burner being eventually extinguished by a slight temporary increase of pressure and a subsequent reduction of pressure.

The fixed piece 2G may be provided with two or more notches or recesses in the upper end thereof, as shown in the detached view Fig. 2 or one or more notches in the lower end thereof as shown in Fig. 2a so that one of a number of lamps or a series oi lamps of a number of series of lamps can be lighted leaving the other lamp or lamps of a series oi lamps extinguished, or both lamps or the series of lamps of a number of series can be lighted and be kept alight if desired. The suspended rod or plate 24 carried by the weighted lever is VVraised by the pressure of gas acting on the bellows or diaphragm which causes the lateral projection on the suspended rod to slide up the inclined side of the piece 26 and then by reducing the pressure oi gas causes the lateral projection to engage the first notch or recess in the upper end 'thereof so as to retain open'the valve of the lamp or series oi lamps required to remain alight, then, by again increasing the pressure of gas, the lateral projection will be again raised into position, then by again reducing the pressure of gas the lateral projec tion will enter the next notch or recess in the upper end of the fixed piece 2G and retain open the valve for admitting the gas to the other lamp or lamps of the other series oi lamps, then when it is desired to extinguish the lamps the pressure oi gas is again increased thereby causing the lateral projection on the swinging rod to pass out of the second recess so that on the pressure of gas being reduced the said projection on the swinging rod 24 will descend and through the lever 11 to which the swinging rod is attached and the lever 7 carrying the valves 5 and 6 reverse the position of the said valves so as to extinguish the main burners of the lamps and open the valves of the pilot burners. v

In the modification shown in Fig. 2UL the notch or recess 28 is in thelower end of the fixed piece 26 and the projection on the lower end of the rod or plate 24 is in the position ready for lighting. When the pressure is raised the projection on the rod 24 rises up the inclined surface 25 oi the fixed piece 26 till it passes over the point 25 the lamp being then lighted. When pressure is lowered the external projection on the rod 24 descends the inclined surface 25and swings clear of the point 2S against the stop 26X. The lamp is now out. If rthe pressure is again raised the lateral projection on the rod 24 rises into the notch 28 and prevents the lamp from lighting as it would otherwise do. When the pressure is again lowered the lateral projection descends and swings clear of the point 28#L into the position for lighting the lamp. Obviously the fixed piece 26 may also be provided with notches at the top as shown in Fig, 2, as well as at the bottom, the object of a notch or notches in the top being to prevent the lamps going out and the object of the notch or notches on the bottom of the fixed piece to prevent the lamp from lighting. One use oi the notch or notches on the bottom of the fixed piece is as follows-Say in a given town the lamps are lit at 8 oclock in the evening at a pressure of 30 tenths. and are put out at a pressure of 15 tenths at midnight but at 5.30 in the morning in consequence of having to supply gas fires the pressure is raised higher than 30 tenths which was the lighting point, let us say to 40 tenths, this would light all the street lamps if it were not for the arrangement oi the xed piece 2G with the notch or notches at the bottom.

Fig. 11 illustrates the hereinbeiore mentioned qualitications, ior retaining alight the main burner oi the lamp while low pressure is extinguishing other main burners, in which the arm 24 with lateral projections 24 thereon is rigidly connected to the lever ll. and the catch 2G is movable in respect thereto, the said catch being rigidly secured to a swinging arm 26L iulcrumed at 26b to the interior oi the closed chamber l.

Similar parts to those illustrated in Fig. l are marked with like letters of reference, and but ior the difference that the arm 24 is rigid and the catch 26 is movable the operations are similar.

Fig. 3 illustrates an arrangement adapted both to light and to extinguish the main' burner oi the lamp by temporary high pressures oi the gas; in combination therewith are shown stops and guards whereby any one ol the number oi lamps, or the lamps oi any area oi a number of areas of lamps, or one or more lamps oi a cluster oi lamps, can be separately lighted or extinguished. Referring, for the time being, to the first mentioned arrangement, i. a. lighting the main burner oi the lamp at the first temporary high pressure oi the gas, and (aiter the pressure of the gas has been reduced) extinguishing the said lamp at the next temporary increase oi pressure, instead of attaching the valves 5 and 6 to a lever connected by a link 9 to the lever ll to which the bellows or diaphragm is secured as hereinbeiore described with reierence to Fig. l., the lever 7 which operates the valves 5 and G oi the lamp may be mounted on the same pivot as a rocking lever 30 having therein a double inclined slot 31, 32, in which engages a pin or projection 33 on the upper end of a rod 24 which is connected at its lower end to an arm 34 of the weighted lever ll which is pivoted at l2 to the interior oi the chamber. The one end of the lever 1l which is connected to the bellows or flexible diaphragm is provided with an adjustable connection 13 in an inclined slot 22 like that described with reference to Fig. l the said connection being ad justable by means oi a screw 2l nearer to or further from the ulcrum l2 oi the lever ll and so regulate the pressure required to operate the valve. l

The projection 33 on the upper end oi the rod 24 extends through the slot in the rocking lever 30 and when the rod 24 is raised by the pressure of gas acting on the bellows or ilexible diaphragm -the projection 33 will tilt the rocking lever 30 on its iulcrum 30X until it has passed its center oi gravity, whereupon it causes one oi the projections 35 to suddenly act upon the lever 7 and turn it on its lulcrum so as to open or close (according to the direction in which the rocking lever is tilted) the valve 5 in the passage leading to the main burner oi the lamp. When the rocking lever 30 is in the position shown in the drawing the valve 5 is opened, the projection 33 on the rod 24 being then in the portion 32 oi the inclined slot in the rocking lever. To close the valve 5 the pressure oi the gas is temporarily slightly increased so as to raise the projection 33 in the portion 32 oi the inclined slot and tilt the rocking lever 30 on its iulcrum 30 until it has passed its center of gravity and caused the projection 35 thereon to suddenly act upon the level' 7 to turn it 011 its iulcrum 30 so as to close the valve 5 of the passage leading to the main burner and opening the valve G of the passage leading to the pilot burner oi the lamp. When the pressure of the gas is reduced the projection 33 on the rod 24 l'alls in the portion 3l oi the inclined slot in the rocking lever 30, in a position to reverse the direction oi the tilt oi the said rocking lever when the rod 2l is again caused to be raised by the next temporary increase oi gas pressure. Reierriug now to the combination oi this arrangement with the stops and guards ior the purpose hereiubeiore mentioned, when it is desired to retain the main burner alight, while temporary increase oi pressure is extinguishing other main burners, one or more stops such as 37 and guard 37" may be provided, the said stop, or stops, 37 and guard 3'?L preventing the projection 33 acting, for the time being, upon the portiony 32 oi the inclined slot in the rocking lever 30. Should it also be desired to retain the main burner extinguished while increase of pressure is lighting other main burners, a similar stop or stops such as 3G, 3G and guard 3G" may he provided, the said stops 3G and 3(3L and guard 3o" similarly preventing the projection 33 from acting upon the portion 3l. oi the inclined slot in the rocking lever 30. 'lhe drawing illustrates by Way oi example, a lamp that is retained alight while a temporary slight increase oi gas pressure has extinguished. others, and eventually upon another temporary slight increase ol pressure the said lamp is extinguished and the lamp is prevented irom lighting until alter one set oi a series ol lamps, and then another set of a series oi lamps have been caused to be lighted by intermittent increases and decreases oi gas pressure.

The parts being in the position as indicated in the drawing, to extinguish the light ol the main burner 3 the pressure oi the gas is temporarily slightly increased (extinguishing other main burners) causing the projection 33 on the arm 2i; to be raised above the stop 37 andv against the guard 37 and lfalling on the opposite side oi the slot 37 upon the pressure oln the gas being reduced. When the pressure oi the gas is again 1emporarily increased the projection 33 will be caused to rise and tilt the rocking lever 3() on its lulcrum 30X until the said lever has passed its center oi gravity and consequently falling causes the projection 35 thereon 1o suddenly act upon the lever 7 and turn it on its lul crum 30 to close the valve 5 ol the passage leading to the main burner 3 and open the valve in the pass ge leading to the pilot burner 4 oi the lamp. Upon the reduction oi the pressure oi the gas the projmrtion 33 on the rod 24 la-lls into the portion 3l oi the inclined slot ol the rocking lever 30 in proximity to, or hearing against the stop 3G.

To light the main burner 3 oi the lamp, alter two seis ol lamps have been lighted, the pressure oi gas is temporarily increased (causing the Iirst required set of lamps to be lighted) so as to raise the rod 211 and cause the projection 33 thereon to pass above the stop 3o and against the guard 36". Upon the pressure of the gas being reduced the arm 2li falls, and the projection 33 thereon bears against the second stop 3G". (ln again increasing the pressure ol the gas, (thereby lighting the second required set ol lamps) the projmftion 33 will pass above the stop 3G and against the guard 36" and iall on the rearward side ol the said stop 36 when the pressure of the gas is again reduced. The arm 24 is now in a position that on the next increase of the pressure of gas the said projection 33 will tilt the rocking lever 30 into the position shown in the drawing and thereby through the lever 7 reverse the positions of the valves 5 and 6 the passage leading to the' main burner of the lamp being then opened and the passage to the pilot burner closed.

Instead of the lever 11 provided with an adjustable counter pressure weight as hereinbefore described there may be substituted therefor a spring 38 as shown in Fig. 4 the said spring being connected at one end to a boss `13b on a stud 13 adjustable on a screw 211. The said screw 21b is carried in a bracket attached to the stud 13, the latter stud being adjustable on the lever 11, and connected to the bellows or diaphragm 15 by the rod 14 as hereinbefore described. By the use of this combination of adjustable stud connections the differences in the gas pressures required to light and to extinguish the main burners of the lamp may be regulated to any desired degree. When the stud 13e carrying the boss 13b to which the end of the spring 38 is connected is near the fulcrum 12 of the lever 11 the lamp is lighted at say 20 tenths and is extinguished at 10 tenths, and when the said stud 13c is further from the said fulcrum 12 the lamp is lighted at say 7 0 tenths and is extinguished at say 60 tenths.

For permanently adjusting or setting the tension of the spring 38 to suit the various working pressures used in different districts the opposite end of the said spring is or may be provided with or connected to a screw 39 passing through a fixed part 40 in the closed chamber 1 and provided with a nut 4l by means of which the tension of the spring can be increased or decreased according to the pressure of gas required to operate the valves.

The bellows or flexible diaphragm 15 and the inclosing casing 16 may be connected to the closed chamber 1 in the manner shown in Figs. 1 and 4 the said connection comprising a socket 42 screwed into an opening in the said closed chamber into which socket 42 is screwed a hollow ferrule 43 between the flange 44 of the ferrule 43 and the flange 45 on the socket 42 are interposed the edges of the opening in the casing 16 and of the bellows or flexible diaphragm 15 so that by screwing the ferrule 43 into the socket 42 the bellows and its casing will be securely connected to the closed chamber 1.

Figs. 13 and 14 show in part sectional elevation and plan respectively a preferred arrangement for connecting the-said bellows or flexible diaphragm 15 and its inclosing casing 16 to the closed chamber 1. An externally screwed ferrule 43 with flattened parts 43*L has a flange 44 over which flange is stretched the bellows or flexible diaphragm 15. In the top of the upper portion of the inclosing casing 16 is a hole, of a size equal to and conforming in shape to the cross section of the screwed ferrule 43 with its flattened parts, permitting the said ferrule entering but preventing the same from turning therein, so that when the upper portion of the casing 16 is placed in position over the bellows or flexible diaphragm 15 and a washer 43b with a suitably shaped hole superposed, the whole can be locked securely together by a clamping nut 45, leaving a portion of thescrewed ferrule 43 protruding which can be screwed into the opening in the closed chamber 1. By this arrangement the inclosing casing 16 can be used as a means for turning the screwed ferrule 43 for connecting to, or disconnecting-from, the closed chamber 1, consequently obviating the need of a spanner, the liability of twisting of the bellows or diaphragm l5, or the interference of the adjustment thereof, being prevented by the flattened parts 43', of the screwed ferrule 43 engaging the correspondingly shaped holes in the inclosing casing 16 and washer 431. Or instead of connecting the bellows in the manner described the said bellows may be connected to its casing by adhesive material so as to be capable of being readily detached when required. The casing 16 may be made in two parts separable one from the other to afford ready access to the bellows without detaching the casing from the chamber 1. 'f

To the casing 16-may be connected a pipe 46, Fig. 5, leading up to the pilot burner 4 so that in the event of the bellows 15 becoming leaky gas will pass through the pipe 46 and be automatically ignited by the pilot burner thereby notifying that the said bellows is defective. f

ln Fig. 6 is shown an arrangement of tubes for maintaining the apparatus warm in cold climates which arrangement comprises circulation pipes 47, 48 connected to the casing 16 and leading therefrom up to the pilot burner 4 round which the pipe 48 is arranged as a coil 49 and passes thence to the flame of the main burner 3 so that heat is transmitted from the pilot or the main burner to the air circulating through the pipes 47, 48 and thus maintains the apparatus warm. -The circulation is produced by the action of the heat from the by pass burner or main burner on the upper end.

Figs. 7 to 10 show the modified arrangement hereinbefore referred to wherein a single rotary disk valve is employed for opening and closing the passages leading to the main burner and pilot burner of the lamp. Fig. 7 being a side view of the weighted lever 11 carrying the rotary disk valve 12c; Fig. 8 is a cross sectional view of the closed chamber 1 showing the said rotary disk valve in position therein, Fig. 9 is a lace view of the seating for the disk valve 12, showing the passage 5, and 6EL leading to the main burner and pilot burners respectively, and Fig. 10 is a face view of the rotary disk valve showing the ports 5b and 61. The weighted lever 11 is rigidly secured to a spindle 12 suitably mounted in the casing 1, the said spindle having a square or other suitably shaped portion upon which is mounted, and turns therewith the rotary disk valve 12. The said rotary disk valve is slidable along the squared portion of the spindle 12, and'is kept in sufficiently close contact with its seating by a spring 12d interposed between the said valve and the weighted lever 11. It is obvious that when the said weighted lever is down, as shown in these detail figures, the port 6b in the rotary disk valve 12c is coincident with the passage 62L in the closed chamber 1 leading to the pilot burner of the lamp, and the said rotary disk has closed the passage 5a leading to the main burner of the lamp; and when the said weighted lever 11 is raised the port 5b in the said rotary disk valve is then coincident withthe passage 5L of the closed chamber 1 leading to the main burner of the lamp and the said rotary disk has closed the passage 6a leading to the aforesaid pilot burner of the lamp.

Fig. l2 illustrates a further modification oi a single slide valve for opening and closing the passages leading to the main and pilot burner ot the lamp. The Weighted lever ll being in the position shown in the drawing, the passageL leading to the pilot burner o the lamp, is open to the interior oi the closed chamber and the passage 5, leading to the main burner of the lamp, is

closed; when the said weighted lever is caused to be' raised on its 'fulcrum l2 it slides through a friction roller 12, the valve 12e on its seating opening the passage 5'L leading to the main burner and closing the passage 6a leading to the pilot burner.

We are aware that it has already been proposed to operate the valves of main and pilot burners of gas lamps, to cause the said burners to be alternately lighted and extinguished by varying the pressure of the gas, and that such apparatus have been provided With (l) a bell or diaphragm in combination with lever mechanism, (2) a spring or a balance Weight adjustably screwed to the end of a lever for determining the operating pressure, (3) cams in connection With a projection on a reciprocating piece for controlling the movements ofthe bell (4) a swinging rod mounted on a bell to operate a notched rocking lever controlling the gas valves, and We do not broadly claim any of these features generally or apart from our improvements.

What We claim as our invention and desire to secure by Letters Patent is l, An apparatus of the class described comprising a gas chamber' having a gas supply inlet, a main and a pilot burner connected to said chamber, a valve controlling the passage to each burner, a rocking lever adapted to open and close said valves in alternation, adjustable reacting means acting upon said lever tending to keep the valve of the main burner normally closed, and a lexible expansible element having connections for overcoming the tension of said reacting means to positively rock said lever and reverse said valves on increase of pressure within the chamber', substantially as described.

2. An apparatus of the class described comprising a gas chamber having a gas supply inlet, a main and a pilot burner connected to said chamber, a valve controlling the passage to each burner, a rocking lever adapted to open and close said valves in alternation, a second rocking lever having a link connection with said first named lever, adjustable reactingl means tending normally to rock said levers in one direction and to keep the valve of the main burner normally closed, and an expansible diaphragm connected to said second lever and adapted under pressure of gas to rock said levers against the force of the reactingmeans, substantially as described.

3. An apparatus of the class described comprising a gas chamber having a gas supply inlet, a main and a pilot burner connected to said chamber, a valve controlling the passage to each burner, a rocking lever adapted to open and close said valves in alternation, a second rocking lever havingr a link connection with said iirst named lever, adjustable reacting means tending normally to rock said levers in one direction and to keep the valve of the main burner normally closed, and an eXpansible diaphragm, an adjustable connection between said second lever and expansible diaphragm, substantially as described.

4. An apparatus of the class described comprising a gas chamber having a gas supply inlet, a main and a pilot burner connected to said chamber, a valve controlling the passage to each burner, a rocking lever adapted to operate said valves in alternation, a second rocking lever having a link connection to said first named lever, a Weight adjustably mounted on one arm of said second lever and tending to rock said lever to keep the main burner normally closed, an expansible elememl adapted to be operated b v increase of pressure within thc clmmbcr to rock said second lever against the action o1` the weight, und :i conY nection between said second lever :1nd expnnsihlc element, substantially as described.

5. An apparatus of the class described comprising n gus chamber having a gas supply inlet, a mnin and :i pilot burner connected to said chamber, a valve controlling the passage to each burner, a rocking lever adapted to operaie said valves in alternation, a second rocking lever having n link connection to said iirst named level', u weight :ldjustably mounted on one arm ot' said second lever, an expansible element adapted to be operated by increase of pressure within the chamber to rock said second lever against the action ot' the weight, and a connection between said second lever and expansible element. and an adjustable stop for limiting`- the movement ot said second le\er, substantially as described.

G. An apparatus of the class described comprising :i gas chamber having a gus inlet, a main and a pilot burner connected to said chamber, valves controlling the passages to said burners, a rocking lever adapted to open and close said valves in alternation, reacting means tending normally to close the vulve to the 11min burner and open that to the pilot burner, an expansible diaphragm adapted under pressure ot gus in said chamber to over come the action of said reacting means, und a check device comprising a swinging clement connected to one oi` the movable parts and a lixed element, one ot said clc ments having a notch and the other a projection adapted to rest in said notch to permit a variation in pressure without corresponding movement oi' the valves, substantially as described.

7. An apparatus of the class described comprising n gas chamber, having :L gas supply inlet, :i main und :i pilot burner connected to said chamber, valves controlling the passages to said burners, a rocking lever a 'ranged to open and close said valves in alternation, :1. pivotcd lcvcr hnving a link connection to said tirst named lever und havingl a horizontally extended arm, a weight adjnstably mounted on said arm, a diaphragm arranged to be operated b v pressure of gas within the chamber and operatively connected to said second named lever, a rod depending from the 1 fe end of said horizontally extended arm, and having u lateral projection, a vertical plate arranged in the path of said projection and having an inclined side and notched upper end, and a dellccting element arranged over said notched upper end and having inclined dellccting surfaces, substantially as described.

S. 111 an apparatus of the class described, :i gus clmmber havingl a gas inlet, main and pilot burners connected therewith, vulves controlling the pass: `es to said burners, reacting means located within the chamber tending normally to close the valve to the main burner and openr that to the auxiliary burner, a casing, a ilcxiblc diaphragm located in Said casing, means connecting both said easing and diaphragm to the gas chamber', :1nd connections between said diaphragm and reacting means whereby expansion of gas in the chamber overcomes said reacting` means :1nd reverses the valves, substantially as described.

9. In an apparatus o1' the class described, :i gas cimmber having a gas inlet, main and pilot burners connected therewith, valves controlling the pas les to said burners, reacting means located within the chamber tending nor mally to close the 'valve t0 the main burner :1nd open that to the auxiliary burner, a casing secured lo the gas chamber and communicating therewith, :ln expunsible element within the casing and arranged to bc expanded b v the pressure of gus in the chamber, connections whereby the expansion of said element shii'is the vulves against the action of the reacting means, and gus pipe connectingI with said casing and terminating in lighting proximity to one of the burners for indicating leakage in the expansible element, substantially :is described.

10. In an apparatus of. the class described, :l gas chamber having a gas inlet, main und pilot burners connected therewith, valves controlling the passages lo said burners, reacting means located within the chamber tending normally to close the valve to the main burner and open that to the auxiliary burner, a casing secured to the gas chamber and communicating therewith, an expansible element within the casing and arranged to be expanded by the pressure of gas in the chamber, connections whereby the expansion of said element shifts the valves against the action of the reacting means, and means for circulating heated air in proximity to said parts for keeping them warm in cold Weather, substantially as described.

EDMUND HARRY ELTON. RICHARD STEPHENS.

Witnesses I. L. OsonN, E. M. TOLERTON. 

